Costnere
Bosworth & Toller Anglo-Saxon Old English Dictionary - costnere
According to the Old English Dictionary:
es;
- costnere
- m. A tempter; tentator :-- Swá swá se geleáfa strengra biþ, swá biþ ðæs costneres miht læsse as the faith is stronger, so is the might of the tempter less, Homl. Th. ii. 392, 20,